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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6e120d7ee151dd5770efd71e9a5bf3d5c0431e5e315f77a242d7b0358038aa' 
  AND token = 'epmPQXgGH8KPqt3YNtgCj9oMmpYvY2esgL8oDUR0OG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}